Steam-generator



(No Model.)

T. L. 8v T. J. STURTEVANT.

STEAM GENERATOR.

No. 408,995. Patented Aug. 13, 1889.

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N. PETERS, Phammhampher. wnshangm, nic,

UNITED STATES PATENT OFFICE.

THOMAS L. STURTVANT AND THOMAS J. STURTEVANT, OF FRAMINGHAM,

MASSACHUSETTS.

STEAM-G EN ERATO R.

SPECIFICATION forming part of Letters Patent No. 408,995, dated August 13, 1889.

Application iiled November 12, 1888. Serial No. 290,570. (No modelJ' To all whom, it may concern:

Be it known that we, THOMAS L. STUETE- vANT and THOMAS J. STURTEVANT, citizens of the United States, residing at Framingham,

in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Steam-Generators; and we do hereby declare the following to be a full, clear, and exact description of the invenro tion, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part .15 of this specication.

This invention relates to steam-generators, and its aim is to produce a device which in its arrangement shall be extremely compact and yet provide a large amount of heating- 2o surface, and, furthermore, which shall reduce the danger from explosions, since the steamgenerating parts are sectional, so called.

The drawings accompanying this specification represent, in Figure l, a sectional eleva- 2 5 tion diametrically and vertically of the generator. Fig. 2 is ahorizontal cross-section on line of Fig. l.

In Fig. l of said drawings is represented a vertical steam-generator composed of a cy- 3o lindrical outer shell A,within the lower middle portion of which is located a fire-pot B, and with an ash-chamber C below the latter. Said shell may be made of any suitable sheet metal; or, as in the present instance, it maybe a water-jacket, which extends down around the iire-pot, and is formed Vby two tubesone inside the other-united at their opposite adjacent ends. The generator is surmounted by a solid disk or plate G, provided with a 4o central feed-opening for the admission of fuel. Contained within said shell or water-jacket A, and located above the iire-pot, is the steamgenerating device D. Said device is composed of a series of concentrically-arranged annular sections E, interconnected, as will be hereinafter described. Each of said steamgenerating sections contains a chamber a. These in the present instance are formed of two tubes b c--one within the other. The adjacent ends of the tubes are then united to create a sealed joint, and thus a closed generating-chamber is produced, while the inner tube is left open at both ends; hence the bore of each inner tnbe'of every steam-generating section serves as a flue to transmit the hot gases or other product of combustion from the fire-pot to the stack or line F, which is secured in the plate G. In thus making steam-generating sections of the described form, and by disposing them concentrically 6o one within the other, a very compact steamgenerator can be obtained, while its capacity is limited only by the number, size, or length of the several tubes which go to make up the individual generating-sections E, as likewise the intensity of the fire. Further, the liability and danger from explosions are reduced, since the generating-chambers are in terconnected, and are all made of the strongest possible form. When the said chambers 7o ad are capillary or contracted, the several sections E are united in series by the pipes d d. The latter are so disposed thatthe watersupply is compelled to take a circuitous course, as shown-that is, the discharge and supply pipes in each section of the series are located at opposite ends. Thus in Figui the water-supply pipee enters at the top of the generating-chamber in the outermost section. The discharge-pipe (l therefrom is located at 8o the lower opposite portion, and connects with the corresponding part of the next adjacent section located interiorly thereof. The discharge or outlet pipe d of this latter section, however, is at the top; hence water forced in proper quantities within the chamber of the outer section is compelled to pass successively through each generating-chamber until when it reaches the chamber of the center section it has assumed the form of dry, 9o highly-heated steam. Thence it passes by the main discharge-pipe f to the engine or other source to be supplied.

What we desire to claim is- 1. A steam-generator composed of a number of steam-generating` sections connected in series, each section being composed of two tubes-one within the other-with their adj acent ends united to form a closed steamchamber, interconnecting pipes at the oppo- 10o site extremities of the sections which unite the adjacent sections, and a common Huidsupply and steanrdischarb'e, ail substantially as herein set forth and described.

2. In combination with a suitable shell, its fire-pot, cO-operating flue, and ash-ehan1ber, an interconnected series of concentricailyarranged steam -generating sections within said shell and the common Huid-supply and steam-discharge, each section being composed oi two tubes contiguous at various pointsone within the other-the adjacent ends bein g united to forni a closed annular chamber therebetween and having' a supply and discharge at opposite ends, substantially as herein speciied.

i3. In combination with an inciosingysheii or water-jacket, a ire-pot B, with its co-operating fine F, the steam-generators E, arranged in sections which are connected in series united by tubes d d to insure water-circuiation, each section being composed of two tubes c--one within the other, and fastened together at their adjacent ends, the interior periphery of one and the exterior periphery of the other non-eontiguousand a connnon iuid-sup1i iy e and steam-discharge f, substantially as and for purposes herein set forth. 4. In a steam-generator, the combination, with a hre-pot B and its flue F, of the series of steam-generating sections E, arranged in sections which are connected in series, constructed and united as set forth, the waterjacket A7 which incioses said sections and tire-pot, and a common 'Huid-supply e and stealn-dischargej", substantial] y as stated.

In testimony whereof we a'ix oursgnatures in presence of two witnesses.

THOMAS L. "PUR'IEVANIV. THOMAS J. ."I`UR'I`.IC\U\N'I`.

XVitnesses:

1I. E. Lonen, FRANCIS (l. STANwooD. 

